Don't define copy ctor in numeric validator classes unnecessarily

There is just no need to do it manually, when the compiler can do the
job perfectly well itself.

No real changes, but this will simplify the upcoming refactoring.

include/wx/valnum.h

@@ -294,12 +294,7 @@ protected:
                       "This style doesn't make sense for integers." );
     }
 
-    wxIntegerValidatorBase(const wxIntegerValidatorBase& other)
-        : wxNumValidatorBase(other)
-    {
-        m_min = other.m_min;
-        m_max = other.m_max;
-    }
+    // Default copy ctor is ok.
 
     // Provide methods for wxNumValidator use.
     wxString ToString(LongestValueType value) const;
@@ -395,15 +390,7 @@ protected:
         m_factor = 1.0;
     }
 
-    wxFloatingPointValidatorBase(const wxFloatingPointValidatorBase& other)
-        : wxNumValidatorBase(other)
-    {
-        m_precision = other.m_precision;
-        m_factor = other.m_factor;
-
-        m_min = other.m_min;
-        m_max = other.m_max;
-    }
+    // Default copy ctor is ok.
 
     // Provide methods for wxNumValidator use.
     wxString ToString(LongestValueType value) const;